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Scanning Electron Microscopy Findings With Energy-Dispersive X-ray Investigations of Cosmetically Tinted Contact Lenses.

Hotta F, Eguchi H, Imai S, Miyamoto T, Mitamura-Aizawa S, Mitamura Y - Eye Contact Lens (2015)

Bottom Line: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed.Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology (F.H., H.E., T.M., S.M.-A., Y.M.), Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan; and Division of Chemistry (S.I.), Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima, Japan.

ABSTRACT

Objective: To investigate the surfaces and principal elements of the colorants of cosmetically tinted contact lenses (Cos-CLs).

Methods: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.

Results: In two Cos-CLs, the anterior and posterior surfaces were smooth, and colorants were found inside the lens. One lens showed colorants located to a depth of 8 to 14 μm from the anterior side of the lens. In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed. The colorants in the other three lenses were deposited on either lens surface. Although a print pattern was uniform in embedded type lenses, uneven patterns were apparent in dot-matrix design lenses. Colorants used in all lenses contained chlorine, iron, and titanium. In the magnified scanning electron microscopy images of a certain lens, chlorine is exuded and spread.

Conclusions: Cosmetically tinted contact lenses have a wide variety of lens surfaces and colorants. Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

No MeSH data available.


Related in: MedlinePlus

Scanning electron microscopy views and mapping analysis of EYE COFFRET 1-DAY UV. (A) The surface of the eyelid side is smooth. (B) The print design is apparent on the posterior side, and the pattern is uniform. (C) A coated thin layer is wrinkled. (D) Blue shows the distribution of chlorine.
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Figure 2: Scanning electron microscopy views and mapping analysis of EYE COFFRET 1-DAY UV. (A) The surface of the eyelid side is smooth. (B) The print design is apparent on the posterior side, and the pattern is uniform. (C) A coated thin layer is wrinkled. (D) Blue shows the distribution of chlorine.

Mentions: The anterior side was smooth (Fig. 2A). The print design was uniform (Fig. 2B). The posterior surface appeared wrinkled under high magnification (Fig. 2C). A thin-coated layer covering the colorants was detected, and the coated layer was wrinkled because of desiccation. The colorants were found embedded in the most superficial layer of the posterior surface of the lens at a depth of 1 μm. Only chlorine was found in the print (Fig. 2D).


Scanning Electron Microscopy Findings With Energy-Dispersive X-ray Investigations of Cosmetically Tinted Contact Lenses.

Hotta F, Eguchi H, Imai S, Miyamoto T, Mitamura-Aizawa S, Mitamura Y - Eye Contact Lens (2015)

Scanning electron microscopy views and mapping analysis of EYE COFFRET 1-DAY UV. (A) The surface of the eyelid side is smooth. (B) The print design is apparent on the posterior side, and the pattern is uniform. (C) A coated thin layer is wrinkled. (D) Blue shows the distribution of chlorine.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4561626&req=5

Figure 2: Scanning electron microscopy views and mapping analysis of EYE COFFRET 1-DAY UV. (A) The surface of the eyelid side is smooth. (B) The print design is apparent on the posterior side, and the pattern is uniform. (C) A coated thin layer is wrinkled. (D) Blue shows the distribution of chlorine.
Mentions: The anterior side was smooth (Fig. 2A). The print design was uniform (Fig. 2B). The posterior surface appeared wrinkled under high magnification (Fig. 2C). A thin-coated layer covering the colorants was detected, and the coated layer was wrinkled because of desiccation. The colorants were found embedded in the most superficial layer of the posterior surface of the lens at a depth of 1 μm. Only chlorine was found in the print (Fig. 2D).

Bottom Line: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed.Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology (F.H., H.E., T.M., S.M.-A., Y.M.), Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan; and Division of Chemistry (S.I.), Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima, Japan.

ABSTRACT

Objective: To investigate the surfaces and principal elements of the colorants of cosmetically tinted contact lenses (Cos-CLs).

Methods: We analyzed the surfaces and principal elements of the colorants of five commercially available Cos-CLs using scanning electron microscopy with energy-dispersive x-ray analysis.

Results: In two Cos-CLs, the anterior and posterior surfaces were smooth, and colorants were found inside the lens. One lens showed colorants located to a depth of 8 to 14 μm from the anterior side of the lens. In the other lens, colorants were found in the most superficial layer on the posterior surface, although a coated layer was observed. The colorants in the other three lenses were deposited on either lens surface. Although a print pattern was uniform in embedded type lenses, uneven patterns were apparent in dot-matrix design lenses. Colorants used in all lenses contained chlorine, iron, and titanium. In the magnified scanning electron microscopy images of a certain lens, chlorine is exuded and spread.

Conclusions: Cosmetically tinted contact lenses have a wide variety of lens surfaces and colorants. Colorants may be deposited on the lens surface and consist of an element that has tissue toxicity.

No MeSH data available.


Related in: MedlinePlus